The passers-by that witness your body on the floor, after you’re ejected from your car. Traumatised for life.

Honestly, I'm not really concerned about this. I don't go through my life trying to limit the chances of people potentially, in an extreme and unlikely situation, seeing my mangled body.

The paramedics trying their absolute best to keep you alive

I have paramedic friends. Wouldn't phase them. They see mangled bodies on the daily.

The firefighters that have to try to get you out of your burning, crumpled vehicle

They do this regardless of whether people wear seatbelts or not.

Your family, or friends, knowing you’ve died traumatically.

This one's fair. But the people close to me know how I am and most of them are realists. People die. You move on. Once you're old enough you've had enough people you know, including peers, die that you get better at coping. If I was really concerned about preserving myself for others, I'd never get in another vehicle again because they're the most dangerous thing we do in our daily lives.

Your close family caring for you for the rest of your life because a relatively minor accident made you paraplegic

Oh I'd take care of myself in that situation. Now, I understand that I could be completely paralyzed and not able to kill myself. That's the one real flaw in this habit of mine, but I just roll the dice on that one. It's pretty unlikely.